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Sometimes your roots desperately need a wash. Dry shampoo won't do. But you also don't want to get into the habit of shampooing more than once a week.
So what do you do?
You co-wash! Co-wash is just a hair code for conditioner washing. Conditioner washing involves "washing" your hair down with a conditioner.
While this may seem counter-intuitive, it follows the same science as oil-cleansing the face. Like attracts like, so when an oily conditioner is placed on an oily scalp, it will draw out excess sebum and simultaneously quench dehydrated strands.
Luckily one of the greatest parts about co-washing is you can take a breather from your sulfate-free, sodium-free product quest.
The best way to maintain any chemically treated hair whether it is color or keratin is to wash less and avoid sulfates and sodium chloride. Sulfates notoriously strip hair of moisture, oils, and treatments, and should be avoided whether you have a chemical treatment or not.
But most people don't realize that sodium chloride, aka table salt, maybe the evil villain behind your poor treatment retention. And the problem is that almost all shampoos contain at least trace amounts of sodium chloride. Luckily most conditioners don't have sodium chloride and have hydrating, color-protecting ingredients that can help maintain your color longer.